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* Goldfish, if properly taken care of, can live a long time. The average lifespan of pet goldfish is 15 years. They'll live 25 years on their own in the wild. There's even a record for a pet goldfish that lived for 43 years!
* Goldfish require a lot of upkeep. You'll need to feed them a couple of times a week and change their water frequently (more of this later, but we're talking 2-4 times a month here).
* Goldfish can be expensive to keep. Cheap feeder goldfish don't cost much, but any other kind of goldfish can set you back anywhere from $5 to $50 a fish. Besides that you'll need to consider your one time start up costs of getting a good sized tank and tank supplies. Count on reoccurring expenses for food and replacing equipment.

* Consider how much living space you have. This will correlate to your tank size. Goldfish, a cool water fish, grow much larger than many tropical fish you'd see in tanks.
* Make sure you buy one that is big enough for how many goldfish you're going to get. Look at the guidelines in the section, ***8220;Getting Your Goldfish***8221; below.
* All things being equal, getting a larger tank will make it easier for you to keep your goldfish healthy. Why? Because larger tanks have larger volumes of water than small tanks. Having more water allows things to take longer before affecting your goldfish. What this means is it gives you "training wheels" so to speak. If you kept your goldfish in a smaller tank, they'll react sooner to any imbalances in the water. Because goldfish are cool water fish, they need more oxygen in the water than other kinds of fish. A larger tank will have more room for you to put in apparatus to bubble the surface. Also, you'll need room for enough filtering since goldfish are such messy eaters.
* Get a tank that is longer over one that is taller. The longer tank will give your tank a higher oxygen to water ratio which is good for goldfish. The larger surface area of the water will allow for better gas exchange between the air and the water. This will help remove more toxic elements from the water.

* Besides the tank, you***8217;ll need some accessories ***8211; light, hood, net, test kits, filtrations, and cleaning equipment (both covered later in the Keeping Your Tank Clean section).
* Getting the tank's bottom ready. Most hobbyists recommend larger sized gravel or river rocks for the bottom or none at all. This is because your goldfish like to forage for food on the bottom and they can choke on smaller sized gravel. Make sure the gravel is smooth because goldfish will suck the gravel into their mouths and then spit them out. They could injure themselves if the gravel has any sharp edges.
* You do not need a heater for your goldfish tank as long as you can keep it at above 60 degrees Fahrenheit. That might seem cold to you but remember, goldfish are not tropical fish. The best temperature range for your goldfish is between 65 and 68 degrees Fahrenheit. You probably don't need to worry about them being too cold unless you're keeping them separate from your living areas (like in a garage or basement).
* A light for the tank makes it easier to see your fish. You can also see the tank's condition better as well.
* You can get either incandescent or florescent lighting. Incandescent lighting is cheaper, but it burns hotter, won't last as long, and uses more electricity. Florescent lighting is probably better for your goldfish tank as it won't warm the water as much.
* Use your aquarium size to figure out how much wattage you need to light the tank. The general rule of thumb is you should have 2 to 2.5 watts per gallon of water for your goldfish tank. As long as you don***8217;t see an increase in algae bloom or the tank temperature, you can go up to 10 watts per gallon of water.
* Light timer. This is a must because goldfish need their light regulated. Unless you are very consistent about turning their light on and off so that they'll get about 10 hours of bright light during the day, go ahead and get a timer for the lights. This will also help for when you go out of town.
* A hood for your tank is a good idea because it will prevent your goldfish from jumping out and it will also shade their eyes from any sudden light switching on them (they don't have any eyelids so this can be stressful on them).
* Make sure you have a strong, stable base for your aquarium. Water weighs roughly 8.4 pounds a gallon. If you buy a 20 gallon tank, that would be 168 pounds. If you can't imagine yourself standing on that shelf for very long, you probably need something stronger.

All About Aquarium Fish: Tank Size for Goldfish
he size of your goldfish tank will depend on area availability and the number of fish that you intend to keep. Goldfish is one of the aquarium fish species that requires large tank size for it to grow well and stays healthy. Main reason for needing large volume of water is because more water will mean heavy waste generated from your goldfish especially ammonia will be diluted to lower concentration and thus less likely to cause any harm. This will also help to prevent spread of aquarium fish disease especially dropsy and swim bladder or flipover condition.

A general rule of thumb before you buy your goldfish tank is to first determine number of fish that you intend to keep in your aquarium. A normal practice based on my own experience is that you will need,

3 gallons of water for every inch (2.5cm) of goldfish length

That means, if you have 4 goldfish with each measuring 3 inches in length, you would require at least 36 gallon fish tank size to accommodate all your pets. However, bear in mind that common goldfish can grow up to 8-10 inches in length and thus your aquarium should be sized accordingly to cater for your pet***8217;s maximum growth. Common mistake made by aquarium owners is to buy smaller tanks when they think that this is more than enough for the younger fry but later found out that, the fish tank size is in fact not big enough after all.

Having the right aquarium size is very important because without much room, this will mean that your goldfish will not be able to reach maximum growth size and will become stunted. This will also lead to development of not proportionately equal fin size.

I had a big post about how I don't need to buy a giant tank for two fish from the fair but it was less than pleasant when all you were doing was trying to help. Soooo, in favor of peaceful posting, I'm going to just say that this post was to show people my new pets, not to get husbandry advice.

I agree whole heartedly with dogsarebetter. Those babies you bought will eventually outgrow that ten gallon tank. Eventually, you'll want about ten gallons per fish, so if you really want to save money in the long run, just get a twenty gallon if you have two, a thirty if you have three...

You will be SHOCKED at how fast they outgrow a ten gallon. I bet it won't take 6 months. The comets like you bought grow very very quickly and get larger then my fancy goldfish.

Goldfish also need very heavy filtration because they are much dirtier as fish go then say the tropical fish like guppies and what not.

You'll want to watch out for high ammonia levels, because goldfish produce more of that then most other fish.

They will eat all live plants in your tank, so if you do want live plants go with swords. The petstore will know that those are.

Good luck with your tank. As a goldfish lover, it's hard to see people put goldies in small tanks and then think it's "fine." I used to be one of those people until another forum that loves gold fish like people here love dogs set me straight. :-)